# 1-51 Two-Digit Addition

### Lesson List

Use addition facts to add two digit numbers.

 2 4 + 4 1

Look at the problem below.

 TENS ONES 2 4 4 1

First you add the 4 and the 1 in the ONES place value.

 TENS ONES 2 4 4 1 5

4 + 1 = 5

Then you add the 2 and the 4 in the TENS place value.

 TENS ONES 2 4 4 1 6 5

2 + 4 = 6

To add a two digit number and a one digit number you add the ONES place value first.

 TENS ONES 3 2 5 8

3 + 5 = 8

Then bring the 2 down.

 TENS ONES 3 2 5 2 8

0 + 2 = 2

Complete the problems below.

 1  7 2  1 1  4 2  5 1  1 1  7 + 2  1 +    5 + 2  3 +    4 + 1  2 + 7  1 1  3 2  4 1  5 1  2 4  4 3  7 + 3  2 + 6  3 + 2  4 + 3  3 + 5  5 + 6  2 4  7 2  3 1  6 4  6 3  7 1  3 + 3  2 + 4  2 +    3 + 5  1 + 2  2 + 4  3

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